An image processing apparatus capable of obtaining a high resolution image from a low resolution image without making processing in a camera signal processor complicated, wherein a CCD image sensor is moved by a CCD drive and a plurality of received light signals having mutually different sampling phases are generated in accordance with imaging results in the CCD image sensor, the received light signals are converted to image signals in an AD converter, the image signals are transformed to a frequency domain signal in a signal processor and multiplied with a plurality of respectively corresponding complex numbers stored in a memory, and the multiplied results are added to generate an image signal free from aliasing components.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A signal processing apparatus, comprising: a transforming means for transforming a plurality of first digital signals having mutually different sampling phases to a plurality of second digital signals in a frequency domain; a memory means for storing a plurality of complex numbers corresponding to said sampling phases; and a processing means for multiplying said plurality of second digital signals and said plurality of complex numbers corresponding to the plurality of second digital signals and adding the multiplied results to generate a third digital signal free from aliasing components.
2. A signal processing apparatus as set forth in claim 1 , further comprising: a phase shift means for shifting the phase of said first digital signals or said second digital signals by exactly a predetermined phase.
3. An image processing apparatus, comprising: an image input means for generating a plurality of first image signals having mutually different sampling phases in accordance with imaging results; a transforming means for transforming the first image signals to a plurality of second image signals in a frequency domain; a memory means for storing a plurality of complex numbers corresponding to said sampling phases; a processing means for multiplying said plurality of second image signals with said plurality of complex numbers corresponding to the plurality of second image signals and adding the multiplied results to generate third image signals free from aliasing components.
4. An image processing apparatus as set forth in claim 3 , wherein: said image input means forms an image of a plurality of color lights passed through a single-plate type color filter on corresponding pixels among a plurality of pixels arranged in a matrix two-dimensionally to generate said first image signals comprised by color data of said plurality of colors; and said processing means performs said multiplication and said addition for every color data of said plurality of color data to generate a plurality of fourth image signals corresponding to said plurality of colors and generates said third image signals by using the plurality of fourth image signals.
5. An image processing apparatus as set forth in claim 4 , wherein: said sampling phase is determined for a predetermined one color among said plurality of colors in order that a sampling pattern of color data of the color included in said plurality of first image signals and a sampling pattern of color data included in said fourth image signals of the color become similar.
6. An image processing apparatus as set forth in claim 3 , wherein said processing means comprises: a spatial shift means for spatially shifting said second image signals in accordance with said sampling phases; a basic spectrum calculation means for multiplying said spatially shifted plurality of second image signals with said plurality of complex numbers corresponding to said plurality of second image signals and adding the multiplied results to calculate a basic spectrum free from aliasing components; and an inverse transforming means for transforming said basic spectrum from a frequency domain to a time domain to generate said third image signals.
7. An image processing apparatus as set forth in claim 3 , further comprising: a drive means for moving said image input means physically, optically, or electrically so that said imaging means can generate a plurality of image signals having mutually different sampling phases in accordance with the imaging results.
8. An image processing apparatus as set forth in claim 4 , wherein: said image input means is a single-element CCD image sensor and said color filter is a primary color filter or a color compensation filter.
9. A computer-readable medium containing instructions for controlling a signal processing system to perform a method, the method comprising the steps of: transforming a plurality of first digital signals of an image having mutually different sampling phases to a plurality of second digital signals in a frequency domain; multiplying said plurality of second digital signals with a plurality of complex numbers corresponding to the plurality of second digital signals; and adding the multiplied results to generate third digital signals free from aliasing components.
10. A computer-readable medium containing instructions for controlling an image processing system to perform a method, the method comprising the steps of: generating a plurality of first image signals having mutually different sampling phases in accordance with imaging results; transforming the first image signals to a plurality of second image signals in a frequency domain; and multiplying said plurality of second image signals with a plurality of complex numbers corresponding to the plurality of second image signals and adding the multiplied results to generate third image signals free from aliasing components.
11. A computer-readable medium as set forth in claim 10 , further comprising the steps of: forming an image of a plurality of color lights passing through a single-plate type color filter on corresponding pixels among a plurality of pixels arranged in a matrix two-dimensionally to generate said first image signals comprised by color data of said plurality of colors and performing said multiplication and said addition for every color data of said plurality of colors to generate a plurality of fourth image signals corresponding to said plurality of colors and generate said third image signals by using the plurality of fourth image signals.
12. A computer-readable medium as set forth in claim 11 , further comprising the steps of determining said sampling phase for a predetermined one color among said plurality of colors so that a sampling pattern of color data of the color included in said plurality of first image signals and a sampling pattern of color data included in said fourth image signals of the color become similar.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
June 1, 2000
June 26, 2007
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